There are many uses for one of these motors on your boat: Running constantly at a slow speed for a slow presentation of an artificial lure or live bait; using your trolling motor intermittently to move from one spot to another searching for schools of fish; more recently, using your motor as an anchor to keep you in one spot - or using your electronics linked to your electric motor to follow the contour of a body of water and stay at a specific depth.
How often do you plan to troll for fish by trailing lures or live bait often used for walleye, white bass, stripers, and other species. Also is good when fishing a new lake to identify bottom structure or where fish are located. Gasoline powered kicker motors are ideal for this.
If your main outboard motor is 100 HP or higher there are advantages to having a small gasoline motor for trolling sometimes called a "Kicker" motor. For reduced gas consumption and noise reduction the small 9-15 horse power gasoline "Kicker" motor is better suited. Adding a "Kicker Motor" is an additional cost but if you can afford it is a nice addition. Our last Canada trip this came in handy as we damaged our main motor and were able to use the 9.9 HP 4 stroke Mercury Kicker motor to get back home.
Three main things to remember when shopping for an electric motor: Size of your boat, where you are able to mount your trolling motor, and how you will likely use your electric motor the most. Secondly, power of thrust and cost. 75 - 80 pound thrust works well on a 20-21 foot aluminum V Body walleye boat. Your dealer will help you decide if uncertain. Cost is more for more powerful motors. Additionally cost will be more based on the motor configuration and what it will do. For example, here are some choices and going down this list gets more expensive:
Transom mount motors sometimes are the only type of trolling motor that will easily fit on certain boats. These are perfect for use in a rented boat or on smaller lakes and ponds with smaller boats as the sole motor on board. You may have to carry with you a portable power supply.
This simply means that the motor is mounted on the bow and is placed into and pulled out of the water by hand. These motors also have a foot controller that with a little practice you can master and control your boat while fishing at the same time.
Recently manufacturers have added additional features for added comfort and convenience. One such feature is the ability to deploy and stow your motor electronically - which is great especially if you have a sore back or are in the boat by yourself. The addition of remote control helps you to keep your focus on fishing more and allows you to control the trolling motor from anywhere in the boat. Certain motors have the ability to link to GPS which means you are able to stay over a certain spot using GPS coordinates (This means with a 5-10 foot diameter) and/or following a pre-determined path, or keeping you along a specific depth of contour. These are all wonderful additions.